Urban Forestry305#2deck Flashcards
Hearing protection is needed for any sound intensity greater than
85dB
Leg protection should be washed and cleaned on regular basis following manufacturers recommendations to
Ensure they remain entirely cut proof
The ideal length for leg protection is
About two inches below the top of the boot
The area of the body that receives the most chain saw injuries in the ground work is the
Left Leg
The most common head injury to tree workers from being struck by a falling object is
Concussion
Hearing injury from loud noise is completely reversible in time
No
Leg protection is designed to stop a chain running full throttle
No
The most common injury from chain saw is a
Laceration
Which component of PPE is not mandated by any regulation or standard, but is still an excellent item to have on hand is
Cell phone
The most common fatal accident scenario from felling a tree is
Being struck by a branch or the falling tree
Laceration is the medical term for
A torn, ragged cut
Chain saw cuts may occur where?
While on the ground, in the aerial lift and while aloft in the tree
Should you walk around site with the chainsaw running
No
The portion of the eye most often lacerated by the chain saw is
The upper eye lid
The medical term for a mass of hardened, inflamed tissue, usually as a result of infection such as a splint of material in the body is
Granulomas
NIHL stands for
Noise Induced Hearing Loss
Appropriate footwear operating a chain saw is
Heavy leather work boots with non-slip tread
The cavity in the ear where sound vibrations are converted to a nerve signal transmitted to the brain is called
Cochlea
The type of gloves that should not be worn, particularly if the wear will be chipping brush are
Gauntlet gloves
One of the major factors why professional saw users such as loggers and arborists, have fewer serious injuries from chain saws compared to occasional users such as homeowners is that
Professionals are typically wearing PPE
What is the most basic element in developing a tree felling plan
Gathering information
The first step in a tree felling plan is to assess
Hazards
In relation to tree felling, obstacle’s are
Anything that can be hurt or damaged
Determining the height of the tree to be felled can help you
Decide if there is enough room to fell it, consider alternative methods of removal, and establish a danger zone around the tree
The danger zone around a tree base should have a radius of
Atleast 1.5 times the height of the tree
The “bad side” of a tree is the where there is a lean
Yes
If a solid tree is being felled towards the north, but has a slight lean toward the east, the “good side” of the tree will be the
west
What are the essential steps in tree felling
Determine the lean of the tree, checking for hazards, and establishing an escape route.
A stepped back cut can be warranted
Anytime an open face notch is used
The total percentage of accidents in tree felling occurs within a 15’ radius of the tree base is
80-90%
The best escape route during tree felling is
The opposite direction of the fall at 45-degree angle
Kickback occurs when an object comes in contact with the
front, upper quadrant of the tip of the chain saw bar
A bore cut is initiated with which part of the chainsaw
The bottom corner of the tip of the bar
Sometimes a forward-leaning tree can split vertically up from the back cut. This creates a dangerous situation called a
Barbers Chair
To which degree should the open-face notch be cut for the most control
70 degrees or greater
The hinge length should be atleast
80% the diameter of the tree
The hinge thickness should be no more than
10% the diameter of the tree
Which is the best option when felling a tree with a forward lean
A bore cut
When using a bore cut for making the back cut in a felling operation the last part to be cut is the
Strap of wood in the back
The 4 chainsaw safety features
Chain catcher Hand/wrist guard Throttle interlock Inertia Hand brake
How do you activate the inertia hand brake
With your two front fingers or your wrist well keeping your thumb wrapped on the front grip. Never take your hand off the front grip. Always have two hands on the chainsaw
What do felling dogs provide
Leverage and control when making a cut
How many chainsaw related injuries are there a year for all users
40,000-90,000
Deaths occur in how many accidents a year
40-60
When does kickback occur
When the top corner of the bar is used
How are bore cuts started
With the bottom corner of the bar
What are the two types of wedges
Felling Bucking
On a felling wedge what are the dogs for and what way do they need to be facing
They are grips and need to face downwards
Do bucking wedges have dogs
No
What are the 6 steps in a felling plan
Check hazards Determine height and lean of tree Equipment check Establish escape route The notch/hinge The back cut
3 root defects are
Girdling No roots on the outside of the root ball One sided root growth on the ball
Has root pruning been shown to improve transplanting success
Yes
When installing a tree how much wider should the hole be than the root ball
2x width
Is a glazed hole okay for planting
No
What section of OHS covers Tree Care Operations
Part 39
Section 796 covers what in tree care operation
The Knot Exemption
What section of OHS are tree care workers and operations exempt from
Section 150.3
Section 793 states that an employer must develop what
Safe work practices and procedures
Fall protection and work positioning are covered by what 2 sections
794 and 795
Safe work practices and procedures are covered by what section
793
The knot exemption is covered by section?
796
Does section 150.3 apply to tree care workers and operations
No
What is the 5-15-90 Rule
Within 5’ of a tree in the first 15 seconds a tree falling is when 90% of injuries or fatalities occur.
Should bystanders or tree workers be within the fall zone of tree when it is being brought down
No
Saw reactionary forces do what when cutting from the bottom
Push
Saw reactionary forces do what when cutting on the top
Pull
Site assessment includes
Drainage test Soil compaction test Soil Texture test
Selecting a nursery trees includes assessing what
Above ground quality Below ground quality
The right tree for the right place includes
ExposureSoil Space constraints Function of planting Hardiness
According to Alberta OHS PART 34, section 3, workers felling trees must use wedges to help topple trees in the intended direction
Yes, they must use wedges
According to studies done in the USA between 1991 and 2016, one tree worker was killed on the job every
2.5days
When writing pruning specifications for your crew it is most important to give instructions that cannot be misunderstood
Yes.
A young urban forest tree can be pruned how many times in the first 15 years of it life to develop a strong, sustainable structure
As many as five times.
